| 1 | /*
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| 2 | Copyright 2006 by Sean Luke
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| 3 | Licensed under the Academic Free License version 3.0
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| 4 | See the file "LICENSE" for more information
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| 5 | */
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| 6 |
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| 7 |
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| 8 | package ec;
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| 9 |
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| 10 | /*
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| 11 | * Exchanger.java
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| 12 | *
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| 13 | * Created: Tue Aug 10 21:59:17 1999
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| 14 | * By: Sean Luke
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| 15 | */
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| 16 |
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| 17 | /**
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| 18 | * The Exchanger is a singleton object whose job is to (optionally)
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| 19 | * perform individual exchanges between subpopulations in the run,
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| 20 | * or exchange individuals with other concurrent evolutionary run processes,
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| 21 | * using sockets or whatever. Keep in mind that other processes may go down,
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| 22 | * or be started up from checkpoints, etc.
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| 23 | *
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| 24 | * @author Sean Luke
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| 25 | * @version 1.0
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| 26 | */
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| 27 |
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| 28 | public abstract class Exchanger implements Singleton
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| 29 | {
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| 30 | /** Initializes contacts with other processes, if that's what you're doing. Called at the beginning of an evolutionary run, before a population is set up. */
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| 31 | public void initializeContacts(EvolutionState state) { }
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| 32 |
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| 33 | /** Initializes contacts with other processes, if that's what you're doing. Called after restarting from a checkpoint. */
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| 34 | public void reinitializeContacts(EvolutionState state) { }
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| 35 |
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| 36 | /** Performs exchanges after the population has been evaluated but before it has been bred,
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| 37 | once every generation (or pseudogeneration). */
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| 38 | public abstract Population preBreedingExchangePopulation(EvolutionState state);
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| 39 |
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| 40 | /** Performs exchanges after the population has been bred but before it has been evaluated,
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| 41 | once every generation (or pseudogeneration). */
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| 42 | public abstract Population postBreedingExchangePopulation(EvolutionState state);
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| 43 |
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| 44 | /** Called after preBreedingExchangePopulation(...) to evaluate whether or not
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| 45 | the exchanger wishes the run to shut down (with ec.EvolutionState.R_FAILURE) --
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| 46 | returns a String (which will be printed out as a message) if the exchanger
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| 47 | wants to shut down, else returns null if the exchanger does NOT want to shut down.
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| 48 | Why would you want to shut down?
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| 49 | This would happen for two reasons. First, another process might have found
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| 50 | an ideal individual and the global run is now over. Second, some network
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| 51 | or operating system error may have occurred and the system needs to be shut
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| 52 | down gracefully. Note that if the exchanger wants to shut down, the system
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| 53 | will shut down REGARDLESS of whether or not the user stated
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| 54 | ec.EvolutionState.quitOnRunComplete. */
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| 55 | public abstract String runComplete(EvolutionState state);
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| 56 |
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| 57 | /** Closes contacts with other processes, if that's what you're doing. Called at the end of an evolutionary run. result is either ec.EvolutionState.R_SUCCESS or ec.EvolutionState.R_FAILURE, indicating whether or not an ideal individual was found. */
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| 58 | public void closeContacts(EvolutionState state, int result) { }
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| 59 | }
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